Refrain on Old MacDonald’s farm

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it’s A 31 letters crossword definition.
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Possible Answers:

EIEIO.

Last seen on: USA Today Crossword – Jan 29 2021

Random information on the term “EIEIO”:

Enforce In-order Execution of I/O, or EIEIO, is an assembly language instruction used on the PowerPC computer processor which prevents one memory or I/O operation from starting until the previous memory or I/O operation completed. This instruction is needed as I/O controllers on the system bus require that accesses follow a particular order, while the CPU reorders accesses to optimize memory bandwidth usage.

Notice the pun in the name; the old children’s song goes “Old MacDonald had a farm, E-I-E-I-O!”. In the book Expert C Programming, Peter van den Linden comments that this instruction is “Probably designed by some old farmer named McDonald” and “There’s nothing wrong with well-placed whimsy.”

EIEIO on Wikipedia